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CAN網(wǎng)絡(luò)實(shí)時(shí)性分析及改進(jìn)

1867867 2011-01-07 | rar | 510 | 次下載 | 5積分

資料介紹

隨著CAN總線控制網(wǎng)絡(luò)的復(fù)雜化，單段網(wǎng)絡(luò)上的控制節(jié)點(diǎn)數(shù)目增多而且網(wǎng)絡(luò)帶寬利用率要求日益提高，這使得總線上優(yōu)先級(jí)屬性低的數(shù)據(jù)傳輸延時(shí)增加。提出“取模增加”法動(dòng)態(tài)改變站點(diǎn)優(yōu)先級(jí)，使優(yōu)先級(jí)較低的站點(diǎn)可以動(dòng)態(tài)地提高優(yōu)先級(jí)，通過(guò)動(dòng)態(tài)改變各站點(diǎn)優(yōu)先級(jí)，保證各站點(diǎn)有均等機(jī)會(huì)獲得總線控制權(quán)，實(shí)現(xiàn)數(shù)據(jù)實(shí)時(shí)傳輸。與TTCAN（時(shí)間觸發(fā)CAN）協(xié)議方式進(jìn)行實(shí)驗(yàn)比較，得出了網(wǎng)絡(luò)延時(shí)特征。在較大網(wǎng)絡(luò)負(fù)載的情況下，對(duì)于事件型消息，采用動(dòng)態(tài)優(yōu)先級(jí)調(diào)度算法可以比CAN方式的網(wǎng)絡(luò)傳輸延時(shí)降低10％，對(duì)于周期型消息，TTCAN方式比采用CAN方式降低網(wǎng)絡(luò)傳輸延時(shí)20％。

Abstract:: ?With the more complexity of CAN-NCS，the number of control nodes in single bus became increased and the utility of the bandwidth are required improvement. this made more delay of the PRI information.This paper proposes a solution named “module increase” to update station priorities to increase some low priority of stations dynamically. By dynamic updating station priorities，all stations have same opportunities to get buses to transmit data in real time. Obtained the network delay characteristics compare with TTCAN. In the case of a larger network load for event-based messages，using dynamic priority scheduling method than the CAN network transmission delay reduced by 10%，for cycle-type news，TTCAN way than the CAN network transmission delay reduced by 20 %.